Datasheet

Typical Performance Characteristics– AD7302
SINK CURRENT – mA
V
OUT
– mV
800
0
0824 6
720
400
240
160
80
640
560
320
480
V
DD
= 5V AND 3V
INTERNAL REFERENCE
T
A
= +25 C
DAC LOADED WITH 00HEX
␣ Figure 2. Output Sink Current Capa-
␣ bility with V
DD
= 3 V and V
DD
= 5 V
REFERENCE VOLTAGE – Volts
ERROR – LSBs
0.5
0
1.0 1.2 2.8
1.4 1.6 1.8 2.2 2.4 2.62.0
0.45
0.25
0.15
0.1
0.05
0.4
0.35
0.2
0.3
V
DD
= 5V
T
A
= +258C
INL ERROR
DNL ERROR
␣␣␣␣Figure 5. Relative Accuracy vs.
␣␣␣␣External Reference
FREQUENCY – Hz
ATTENUATION – dB
1 10 10k100 1k
10
5
–40
0
–5
–10
–15
–20
–25
–30
–35
V
DD
= 5V
EXTERNAL SINEWAVE REFERENCE
DAC REGISTER LOADED WITH FFHEX
T
A
= +25°C
␣␣␣␣␣␣Figure 8. Large Scale Signal
␣␣␣␣␣␣Frequency Response
SOURCE CURRENT – mA
V
OUT
–
Volts
02 846
5
4.92
4.2
4.84
4.76
4.68
4.6
4.52
4.44
4.36
4.28
V
DD
= 5V
INTERNAL REFERENCE
DAC REGISTER LOADED
WITH FFHEX
T
A
= +25°C
Figure 3. Output Source Current
Capability with V
DD
= 5 V
–50 –25
100
TEMPERATURE –
C
5.0
3.5
2.0
I
DD
– mA
4.5
4.0
3.0
2.5
INTERNAL REFERENCE
LOGIC INPUTS = V
DD
OR GND
BOTH DACS ACTIVE
V
DD
= 5.5V
V
DD
= 3.3V
1.5
1.0
0.5
0
0 255075 125
Figure 6. Typical Supply Current
vs. Temperature
T
←
V
OUT
V
DD
= 3V
INTERNAL VOLTAGE
REFERENCE
FULL SCALE CODE
CHANGE 00H-FFH
T
A
= +25°C
1 ←
3
←
2
←
V
OUT
CH1 5V, CH2 1V, CH3 20mV
TIME BASE = 200 ns/Div
WR
Figure 9. Full-Scale Settling Time
SOURCE CURRENT – mA
3.5
1.0
01 8234567
3.25
2.5
2.25
1.75
1.25
3.0
2.75
2.0
1.5
V
OUT
– Volts
V
DD
= 3V
INTERNAL REFERENCE
DAC REGISTER LOADED
WITH FFHex
T
A
= +25°C
Figure 4. Output Source Current
Capability with V
DD
= 3 V
V
DD
– Volts
I
DD
– mA
5.0
3.0
1.0
4.0
2.5 3.0 5.53.5 4.0 4.5 5.0
LOGIC INPUTS = V
DD
OR GND
LOGIC INPUTS = V
IH
OR V
IL
BOTH DACS ACTIVE
INTERNAL REFERENCE USED
T
A
= +25°C
2.0
6.0
7.0
Figure 7. Typical Supply Current
vs. Supply Voltage
PD
V
OUT
AD7302 POWER-UP TIME
V
DD
= 5V
INTERNAL REFERENCE
DAC IN POWER-DOWN INITIALLY
1
2
CH1 = 2V/div, CH2 = 5V/Div,
TIME BASE = 2 µs/Div
␣ Figure 10. Exiting Power-Down (Full
␣ Power-Down)
–7–
REV. 0